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Date:   Tue, 10 Oct 2017 21:50:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adrian Salido <salidoa@...gle.com>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 4.9 085/105] HID: i2c-hid: allocate hid buffers for real worst case

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Adrian Salido <salidoa@...gle.com>

commit 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b upstream.

The buffer allocation is not currently accounting for an extra byte for
the report id. This can cause an out of bounds access in function
i2c_hid_set_or_send_report() with reportID > 15.

Signed-off-by: Adrian Salido <salidoa@...gle.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
Signed-off-by: Guenter Roeck <groeck@...omium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/i2c-hid/i2c-hid.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -604,7 +604,8 @@ static int i2c_hid_alloc_buffers(struct
 {
 	/* the worst case is computed from the set_report command with a
 	 * reportID > 15 and the maximum report length */
-	int args_len = sizeof(__u8) + /* optional ReportID byte */
+	int args_len = sizeof(__u8) + /* ReportID */
+		       sizeof(__u8) + /* optional ReportID byte */
 		       sizeof(__u16) + /* data register */
 		       sizeof(__u16) + /* size of the report */
 		       report_size; /* report */


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